Not for the machine this category is famous for, and not for any other model. Its page offers "QuietSift® technology that minimizes noise during the cleaning cycle" and quiet cycles that "benefit skittish cats", and then no number, anywhere.
PETKIT, the other giant, publishes 35 dB claims across its mid range and nothing at all for its $799.99 flagship Purobot Ultra.
The pattern is familiar on this site.
The massage gun leader trademarks QuietForce and prints no number, the shredder leader trademarks SilentShred and prints no number, and here the litter box leader does the same with QuietSift. A trademark is a promise to the trademark office, not to you.
Both machines sit under also considered, each with its reason. That is not a verdict that they are loud; there is simply nothing to rank. The aquarium aisle has its own version, where Tetra sells a Whisper air pump with no number, as our aquarium pump guide explains.
When is a self-cleaning litter box loudest?
During the cleaning cycle, when a motor turns the drum for a couple of minutes after each visit. Standby is effectively silent on every machine.
The noise comes in bursts, which leaves the cycle number as the only one worth having.
Meowant is the single maker in this survey to supply one: "The maximum stated operating noise is 35 dB or lower, helping reduce disruption during automatic cleaning cycles." A ceiling, tied to the right phase. Everyone else prints a number against the word operation, or the motor in Casa Leo's case, and leaves you to guess which minute it describes.
Furbulous, at the other end, publishes the category's only worst case: "The highest noise level of Furbulous Box in operation is 60dB, which only appears for seconds", helpfully compared to a conversation at one metre. Sixty is the biggest number on this page and arguably the most trustworthy, because it describes the loudest moment rather than the quietest.
PETKIT's Max 3 page gives two figures
35 dB in the description, 45 dB in the FAQ, for the same Purobot Max 3.
The description promises "whisper-quiet 35dB operation". Further down the same page, the FAQ answers a noise question with "engineered to operate at a whisper-quiet 45dB". PETKIT does not reconcile them. Ten decibels is not a rounding error. It is the distance between the category's best claims and its middle, and when a maker prints two numbers for one machine, the page is telling you how much weight those numbers were built to carry. Both are on file here, and the PETKIT pick is the Max Pro 2, whose page carries one figure and sticks to it.
None of these makers gives a measuring distance or cites a standard, and only one names the cycle phase. Most figures are ceilings, best cases or bare numbers in marketing prose rather than spec rows, and a cluster at 35 dB across five brands looks more like a convention than five coinciding measurements.
Read the table the way it was built: the shape of each claim first, the safety hardware second, the digits last. Meowant's 35 dB cycle ceiling and PETKIT's 35 dB operation claims match only in print, and two litter box claims with no test conditions cannot be lined up.
A water fountain is the other pet machine that runs all night. Our guide to pet water fountains finds the same habit of bare numbers, 20 dB and 23 dB claims that name no distance, and quotes support pages saying low water is what makes a fountain gurgle and drip.
If an air purifier shares the room with the litter box, see the quietest air purifier for pets for the auto modes that ramp up at every trip to the box, and how to stop them.
